Improvement in dentistss operating-chairs



2 Sheets-Sheet 1.

G. w. TRIPP.

DBNTISTS CHAIR. v No. 19,052. Patented Jan. 5, 1858.

1K: mums PETERS no. PNDTO-LITMOH WASHINQCN. n c.

2 Sheets-Sheet 2.

G. W. TRIPP.

DENTISTS CHAIR.

No. 19,052. Patented Jan. 5, 1858.

UNITED STATES PATENT OFFICE.

GEORGE W. TRIPP, OF AUBURN, NEV YORK.

IMPROVEMENT IN DENTISTS OPERATING-CHAIRS.

Specification forming part of Letters Patent No. 19,052, dated January5,1858.

To all whom zit may concern.-

Be it known that I, GEORGE \V. TRIPP, of Auburn, in the county ofCayuga, State of New York, have invented certain new and usefulImprovements in Dental Operating- Qhairs, of which the following is afull, clear, and accurate description, reference being had to theaccompanying drawings, forming part of this specification, in which-Figure 1 represents a sectional elevation of a dental chair embracing myimprovements.

' Fig. 2 represents a plan of the under side of the chair. Fig. 3represents a rear elevation of the same; and Fig. 4 represents a plan ofthe supporting-frame of the chair, showing the arrangement of theholding-catches.

In the construction of dental chairs and in the arrangement of theadjusting mechanism the object to be attained is to place the head ofthe patient under the least possible restraint and in the most favorableattitude for the operator.

To effect this with ease, rapidity, and accuracy has been the object ofmy improvements in this class of chairs, and itonly can be done by theoperator having perfect and entire control of all the adjustingmechanism from his operating position in the rear of the chair, (Withoutstooping,) as in that position he is enabled to overlook the patient andat once regulate and make the different adjustments for placing thepatient in the proper position without the necessity of repeated trials.

The objections to the dental chairs as heretofore constructed are thatthe different adjustments are not sufficiently independent of eachother, one adjustment frequently affect ing others, and some of theadjustments can only be made when the patient is out of the chair. Theadjusting mechanism is also arranged so as to operate from differentparts of the chair, and to make some of the adjustments the operator isobliged to stoop, thereby preventing him from observing the degree ofchange he has made in the position of the patient, thus frequentlyinvolving the necessity of readjusting the chair before the patient isplaced in the right position.

The object of my improvements is to over come the beforeanentioneddefects in dental chairs; and my invention for effecting this consists,first, in arranging the handles of the holding and releasing catches ofthe adjusting mechanism in connection with the arrangement of theadjusting mechanism, so that the operator from the rear of the chair andwithout stooping has entire control of all the adjusting mechanism,thereby enabling him while in his operating position to adjust andregulate the chair, so as to bring the patient in the most favorableposition for operating; second, in arranging the adjustable rods forregulating the height and also the inclination of the chair, so that oneset is made the fulcrum on which the chair turns and is steadied whilethe other set is being raised or depressed, and the chair itself forms apowerful bent lever by which the operator is enabled to make theseadjustments from the rear while the patient is in it.

In the accompanying drawings is represented an adjustable dental chairembracing my improvements.-

The body A of the chair is constructed on the most approved form fordental chairs and is supported by a stand B, to which are attached thedifferent catches for holding the chair in position as it is adjusted.

On the under side of the body of the chair is a strong metallic frame 0in the form of a letter X, with the ends connected, and extends from thefront to the rear.

The seatD of the chair is movable and rests on an adjustable notchedstandard a, passing through the center of the frame C. To the lower endof the standard is hinged alever b, which is pit'oted to a stud c andextends back to the rear of the chair. In the outer end of the lever aretwo pins 6 f, for holding a bent operating-bar g, for raising andlowerof the chair, so as to be out of the way and in a convenientsituation for the operator, and it is held in that position by notches7L on the end of the lever, in which it catches as it is raised afterbeing depressed for the purpose of elevating the seat.

A spring holding-catch i, operated from the back of the chair by theknee, holds the seat as it is raised by springing into notches 7c in thestandard a.

To the sides of the metallic frame are hinged supporting-rods Z, whichpass through brack ets m, confined to the sides of the stand.Spring-catches a work through the brackets and hold the rods Z in place,and also the ing the seat. The bar stands close to the back the chair atany inclination.

chair as it is raised or lowered. The catch rods 71 passthrough a girt0, connecting the sides of the stand, and are riveted to a crossbar 19,which is operated by a rod q, extending to the rear of the chair.

A link 4", for regulating the inclination of the chair, is hinged to thebottom of the chair in front and is provided with adjusting-holes 8,into which enters a spring-catch t, to hold The catch-rod 15 extends toand is operated from the rear of the chair. I

A head-rest E is hinged by a rod u, on which it slides, to an adjustablebar '0, which enters the top of the back of the chair and is confined toit by a clamp w A clamp 00 also holds the rest E to the bar 1) andadmits of its being inclined or slid laterally, while at the same timeit can be turned transversely to the back of the chair by turning thebar 11 in its clamp.

The different adjustments are made as follows:

The seat is raised by depressing the bent bar g and lowered bydepressing the same bar until it receives the weight of the seat. lVhenthe holding-catch 2' is released by the pressure of the knee, then thebent bar is raised, thus gradually lowering the seat to the prop erposition.

To elevate the chair, the operator inclines it forward by pressingagainst the top with his hand, and in lowering it the catch-rod q isdepressed by the foot "and the chair eased down by the operator placinghis hand on the back. In adjusting the inclination the catchrod i ispressed in by the leg and the chair inclined backward or forward by thehand of the operator. It will be seen that from the position of theelevating and supporting rods land inclining link 0" they respectivelyact as a fulcrum on which the chair turns while one or the otheradjustment is being made and at the same time steady the chair,preventing it from inclining laterally. The chair also by thisarrangement forms a powerful in dental operating-chairs, what I claimtherein as new, and desire to secure by Letters Patent, is

1. The arrangement of the holding and releasing catches and of the adjusting mechan ism, as described, so that all the adjustments can be madefrom the rear of the chair without stooping.

2. Combination of the supporting-rods Z with the inclining link 7*,arranged as described, for the purpose herein set forth.

In testimony whereof I have subscribed my name.

GEORGE \V. TRIPP.

WVitnesses:

EDWARD RATHBUN, EDWIN R. GRIDLEY.

